$ git clone -n https://src.fedoraproject.org/rpms/ghc-gi-gdkpixbuf.git /var/lib/mock/f38-build-side-42-init-devel-763769-27709/root/chroot_tmpdir/scmroot/ghc-gi-gdkpixbuf
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-763769-27709/root/chroot_tmpdir/scmroot/ghc-gi-gdkpixbuf'...
$ git fetch origin 375eb5c7be74374946b4499533bb0929b3605dfc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-gi-gdkpixbuf
 * [new ref]         375eb5c7be74374946b4499533bb0929b3605dfc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 375eb5c rebuild